Example of Rib Feature Sketches

Single open sketch on face. The arrow indicates the direction of the rib feature. Rib feature applied using Parallel to Sketch as the Extrusion direction.
   
Sketch on parallel plane, same distance as used for the Base-Extrude (30mm). The arrow indicates the direction of the rib feature. Rib feature applied using Normal to Sketch as the Extrusion direction.
   
Sketch on plane, parallel to the plane used for the Base-Extrude (15mm). The arrow indicates the direction of the rib feature. Rib feature applied using Parallel to Sketch as the Extrusion direction.
   
Multiple open sketches on parallel plane, same distance as used for the Base-Extrude (30mm). The arrow indicates the direction of the rib feature. Type: Linear Type: Natural
  Rib feature applied using Normal to Sketch as the Extrusion direction.